William r



(No Model.)

W R. PATTERSON SPRING JACK SWITCH. No. 464,519. Patented De,o.8,` 1891.

"Il" man,

UNTTED STATES PATENT OFFICE.

lVILLIAM R. lA'VFERSON, OF CHICAGO, ILLINOIS, ASSIGIIOR TO Tl IE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

SPRING-JACK SWITCH.

SPECIFICATION forming part of Letters Patent No. 464,519, dated December 8, 1891.

Application ined May 27,1ao.

To all 1071.012?, t mtl/y concern.'

,Be it known that I, WILLIAM R. PATTER- SON,'a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,haveinventeda certainnewand useful Improvement 1n Spring-J ack Switches, (Oase 86,) of which the followingis a full, clear, concise, and exact description, reference being had to the' accompanying drawings, forming xo a part of this specification. l

Myinvention relates to spring-j ack switches specially Y designed for use upon telephoneexchange switch-boards; and its object is to provide a construction which will prevent any impairment of the electrical connections resulting from accumulations of dust.

My invention' consists in the construction of a metallic frame or tube, in combination with the contact spring or lever placed in a 2o vertical plane within the frame, the parts being so arranged that the contacts shall be covered, while at the same timel an aperture is provided below them for any dust to fall out that may perchance get within the switch. The frame consists of a socket having projections extending toward the rear of the switch-board, the projection above serving as the shield and the projection below preferably serving as theline connection. A block 3o of insulation is held between the rear ends of these projections, the contact-lever being mounted on one side thereof and the contact point, against which the lever is adjusted to normally rest, being mounted upon the other 3 5 side of said block ofinsulating material. The contact-spring has its free end presented to the opening in the tube, so that when a plug is inserted-as, for example, an ordinary loopplng-the lever will be lifted from its contact 4o and closed to the tipv of the plug, while the sleeve of the plug will be in contact with the socket or frame.

Myinvention will be readily understood by reference to the accompanying drawings, in 4 5 which- Figure l is a horizontal sectional View illustrative of a spring-jack embodying my invention with a loop-plug inserted therein. Fig.

2 is aperspective view of the switch removed Serial No. 353,294. (No model.)

from the switchboardand thelever bcing50.

broken away. Fig. 3 is a plan view thereof.

Like parts are indicated by similar letters of reference throughout the different figures.

rlhe metallic frame consists of the socket o., which is inserted in the switch-board, pref- 5.5 erably from the rear, to form the plug-hole. rllhe projection I) forms the dust-shield above the contact of the spring c with the contactpiece d. It should be observed that the spring forming the lever is placed in a vertical 6o plane instead of in a horizontal plane, as has been usual heretofore, and in'position to rest against its opposing contact, which comes directly under the dust-shield, this lever and the piece forming its normal contact being mounted upon the block e, of insulating material, held between the projections b and f of the frame. It will be observed that the lower proj ection f is cut away under the contact between theleverand its opposing contact-piece 7o to permit any dust that might perchance get within the switch to fallout. The connection bet-Ween the frame and the wire is preferably made with the lower projection f, which is extended forthis purpose.

In construct-ing the frame the front or tubular portion forming the socket may be turned out in a single piece, while the projections b f may be stamped out in a single piece and bent in proper form and then inserted and sol# 8o dered into the tube, as shown. Thus the frame, including the projections, is made to consist of an integral piece. The block of insulation is secured between these projections with the contact-piece and lever properly mounted 8 5 thereon. l

My spring-jack switch thus constructed is simple in construction and durable and not liable to be impaired by Vany accumulati-on of dust between the lever and contact-piece. gro Ordinarily theline coming in will ybe connected with the lever and the line out or the return portion of the line with the frame.v When the loop-plug is inserted, the line in is opened at the contact and closed to the tip of the plug, while the sleeve of the plug makes connection with the frame, as is usual.

Having thus described my invention, I

claim as new and desire to secure by Letters Patentl. The combination, with the frame consisting of the tube provided with the projections forming anintegral piece, of the block of invsulating material placed between the projections, with the lever and its opposing contact# piece properly mounted thereon, the contact between said lever and contact-piece being,r

shielded by the upper projection of the frame,

substantially as and for the purpose specified.

2. rlhe combination, with the frame consisting of the tuber provided with theprojections forming an integral piece, of the block of insulating material placed between the proj ections, with the lever and its opposing.,r contactpiece properly mounted thereon, the contact between said lever and contact-piece being shielded by the upper projection of the frame,

andthe lower projection being cutaway to vprovide an aperture under said contact, Sub

stantially as and for the purpose specified.

3. A frame of the spring-jack switch having rearwardly projectingr metallic pieces supporting the block upon which the lever and contact-piece of the switch are mounted, Ithe upper of said projecting metallic pieces being placed above the contact between the lever and its the j lower projecting piece being cut away to form an aperture under the contact, substantially asjand'for the purpose specified.

Inwitness whereof I hereunto subscribe my naine this 22d day of May, A. D. 1890.

l XVILLIAM R. PATTERSON Witnesses:

GEORGE P. BARTON,

ELLA EDLER.

contact-piece to form a dust-shield, 

